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Most recent advances in understanding of the sources of iodine are presented, the results of field observations are described, and the progress made in laboratory studies of elementary processes and nanoparticle formation as well as numerical modeling of reactive iodine chemistry and particle formation is discussed. A recent study in the shelf region of the English Channel shows that seawater C 2H 5I, CH 2ICl, CH 2I 2 and CH 2IBr exhibit similar though less pronounced trends in seasonality to CH 3I, with maxima in the summer months. Martino et al. showed that direct oxidation of I in the sea surface microlayer by atmospheric O 3 results in potentially significant production of reactive organoiodine compounds. Aiuppa et al. measured emissions of bromine and iodine from Mt. Etna passively with base-treated filters that capture only acidic species.
Saiz‐Lopez et al. (Thu,) studied this question.
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